Advances in science and technology have gradually increased the amount of information that should be dealt with by the police. Given this reality, today s police need to find answers to how to use the Big Data acquired from their everyday activities. South Korean police are no exception. In particular, it is important for the police to decide who to share crime data with. Since there are pros and cons on this issue, the present study attempts to investigate the current situation in the US where crime data are actively utilized as a means of improving the police-citizens communication. Based on several principles, both federal and state laws, as well as each agency s philosophy, are found to respectively influence the issues of sharing crime data with citizens. To prepare for the relatively new paradigm in South Korea, it is necessary to establish detailed guidelines. Specifically, it should be noted that to form a strong partnership with various community agencies is a prerequisite to successfully share crime data with Korean citizens.